Murciélojo (Eyetwitch)
Murciélojo 
Cuando el Murciélojo muera, aprende. (Puedes mostrar una carta de Lección de la cual eres propietario de fuera del juego y ponerla en tu mano o descartar una carta para robar una carta.)
Texto de reglas (Oracle, inglés)
When this creature dies, learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)
Los oculomantes los ven como el ingrediente ideal para las pociones. Los murciélagos no lo ven de la misma manera.
Legalidad
Aclaraciones de reglas (en inglés)
2021-04-16
If a card is brought into the game from outside the game, it will stay in the game until it ends or until its owner leaves the game, whichever comes first.
2021-04-16
If you bring a card into the game from outside the game in a Constructed tournament (or a Constructed game played under tournament conditions), you may select only a card from your sideboard. In casual Constructed games, the card comes from your collection.
2021-04-16
If you bring a card into the game from outside the game in a Sealed Deck or Booster Draft event, you may select only a card that is in the card pool that you built your deck from.
2021-04-16
If instructed to learn, you may do nothing. Discarding a card and putting a Lesson card into your hand are both optional.